How to not escape html entities in a submit button value?

In my form class I am adding a submit button:

$this->add([
    'name' => 'submit',
    'attributes' => [
        'type' => 'submit',
        'value' => 'Login ▹',
    ],
]);

The output is:

<input name="submit" type="submit" value="Login &amp;#9657;">

How do I stop the value from being escaped?

Edit

Based on @RubenButurca answer, here is the output:

It felt odd escaping the value of my submit input. When I tried values such as <i class="fa fa-caret-right"></i> it, well, didn't escape the quotes and I ended up with random attributes in my input element. As such, I've swapped from an input field to a button.

$this->add([
    'name' => 'submit',
    'type' => 'button',
    'attributes' => [
        'type' => 'submit',
        'required' => 'required',
        'value' => 'Login <i class="fa fa-caret-right"></i>',
    ],
    'options' => [
        'label_options' => [
            'disable_html_escape' => true,
        ],
    ],
]);

ZendButon requires a label, which I didn't want. So I extended the view helper to take the label value from the element value ($buttonContent). Because there is no label attribute there is no label echoed, but the escaped value is still shown in the button tags.

FormButton:

use Zend\Form\View\Helper\FormButton as ZendFormButton;
use Zend\Form\ElementInterface;

class FormButton extends ZendFormButton
{
    /**
     * Invoke helper as functor
     *
     * Proxies to {@link render()}.
     *
     * @param  ElementInterface|null $element
     * @param  null|string           $buttonContent
     * @return string|FormButton
     */
    public function __invoke(ElementInterface $element = null, $buttonContent = null)
    {
        if (!$element) {
            return $this;
        }

        // New code here
        if(is_null($buttonContent)) {
            $buttonContent = $element->getValue();
        }
        return $this->render($element, $buttonContent);
    }

}

Output:

<button type="submit" name="submit" value="Login <i class=&quot;fa fa-caret-right&quot;></i>">Login <i class="fa fa-caret-right"></i></button>